n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 10 |
4 | 40 |
5 | 296 |
6 | 1936 |
7 | 17872 |
8 | 164480 |
9 | 1820800 |
10 | 21442816 |
11 | 279255296 |
12 | 3967316992 |
13 | 59837670400 |
14 | 988024924160 |
15 | 17009993230336 |
16 | 318566665977856 |
17 | 6177885274406912 |
18 | 129053377688043520 |
19 | 2786107670662021120 |
20 | 64136976817284448256 |
21 | 1525720008470138454016 |
22 | 38350749144768938770432 |
[1,1,2,10,40,296,1936,17872,164480,1820800, 21442816,279255296,3967316992,59837670400, 988024924160,17009993230336,318566665977856, 6177885274406912,129053377688043520, 2786107670662021120,64136976817284448256, 1525720008470138454016,38350749144768938770432] |